Crushing-roll.



No. 673,768. Patented may 7, lam.

C. R. FLEMING.

CRUSHING ROLLS.

(Application led fune 9, 1900.)

(No Mudel.)

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UNTTEE STATES PATENT OEEICE.

CHARLES R. FLEMING, OF BLACK WARRIOR, ARIZONA TERRITORY, ASSIGNOR TO THEDARIUS GREEN MIN ING COMPANY, OE TUCSON,

ARIZONA TERRITORY.

CRUSHING-ROLL.

SPECIFICATION forming part of Letters Patent No. 673,768. dated May '7,1901.

Application led June 9, 1913i). Serial No. 19,780. (No model To all whomit may concern,.-

Be it known that I, CHARLES R. FLEMING, a citizen of the United States,residing at Black Warrior, in the county of Gila and Territory ofArizona, have invented a new and useful Crushing-Roll, of which thefollowing is a specification.

My invention isan improvement in crushing-rolls designed to work clayground, sand, gravel, and other similar formations containing lumps andparticles of a harder formation which it is not desirable to crush, therolls being especially adapted fpr crushing certain classes of ore.

The object of my invention is to effect improvements in the constructionof the rolls whereby particles of a hard formation which it is notdesirable to crush will pass through the rolls without aecting theefficient operation thereof on the softer particles.

My invention consists in the peculiar construction and combination ofdevices hereinafter fully set forth, and pointed out in the claim.

In the accompanying drawings, Figure l is a transverse sectional view ofa pair of crushing-rolls constructed in accordance with my invention.Fig. 2 is a longitudinal sectional view of one of the rolls. Fig. 3 is atop plan view of a pair of my crushing-rolls.

On the roll-shaft l is placed a cylindrical core-spring 2, which may bemade of indiarubber or any other suitable elastic material, or the samemay he made of metal and suitably constructed to render the same elasticat all points ofits surface. On the said corespring is placed a series Vof circular disks 3, the' same having central openings through which thecore-spring passes. The said openings are of the same size as thediameter of 'the core-spring, the latter iitting snugly in said opening,as indicated in the drawings. A pair of heads 5 are secured firmly onthe axle-shaft l at the ends of the roll, as shown, or in any othersuitable manner, the said heads bearing against the end disks andserving to maintain the disks in contact with each other throughout theroll. Bolt-rods extend through openings 7 in the series of disks andthrough openings in the heads 5 and serve to clamp the heads firmly onthe ends of the core-spring and against the end disks. The said boltrodsare preferably arranged diametrically opposite each other, as shown, andusually two of such rods will suffice, as indicated in the drawings; butthe number thereof may be increased as may be required. The openings 7in the disks through which the said boltrods pass are considera blylarger than said bolt-rods, and said openings are of suitable shape,either angular, as here shown, or circular or curved. rlhe disks 3 areunequal in size alternately throughout the series, the smaller disksbeing interposed between the larger disks, as indicated in the drawings,thereby providing the roll with a corrugated surface. Vhen a pair ofrolls are combined in operative relation, as shown in Figs. l and 3, thelarger disks of one roll enter the spaces between the larger disks ofthe opposing roll. The core-spring maintains the series of disks on theroll concentrically with the axis thereof under normal conditions, butpermits of the independent eccentric movement of one or more of thedisks under abnormal conditions, as hereinafterindicated.

When a pair of my improved rolls are arranged in operative relation toeach other, as hereinbefore described, the same are efficient incrushing soft ores and friable ores and the like formations. Whenparticles of a harder formation which it is not desirable to crush areencountered by the rolls, such of the coacting disks as are in contactwith such harder particles are displaced thereby eccentrically withrelation to the axes of the rolls against the tension of thecore-springs thereof, thus allowing such harder particles to passbetween the rolls without being crushed, whereupon the disks are causedby the springs to vinstantly reassume their normal concentric positionswith relation to the axes of the rolls. It will be understood that bythus providing the crushing-rolls with independently eccentricallymovable disks and springs to restore the same to their normal positionconcentric with the axis of the rolls the latter are adapted t0 yield topermit the passage between them of hard unyielding substances withoutimpairing their efficiency in crushing softer particles or substanceswhile said hard particles or substances are passing between them.

Having thus described my invention, I claim- A pair of coactingcrushing-rolls, each cornprising a shaft,a cylindrical core-springthereon, a series of disks on said Core-spring, movable eccentricallywith relation to the axis of the roll independently of each other, andsaid core-spring serving to normally retain said disks concentricallyWith relation to the axis ofthe roll,each alternate disk being ofgreater diameter than the intermediate disk, said CHAS. R.` FLEMING.

Witnesses:

SYLvIa KENNEDY, GEO. H. RICHEY.

